linux-kernel - Re: linux-next: build failure after merge of the percpu tree

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Message-ID: <CAHVXubio372X_xXiWBMYk5=C7K49Wv6uki-uqWk1eyH-YuGGnA@mail.gmail.com>
Date:   Mon, 11 Dec 2023 09:31:25 +0100
From:   Alexandre Ghiti <alexghiti@...osinc.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux-foundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the percpu tree

Hi Stephen,

On Mon, Dec 11, 2023 at 7:14 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi all,
>
> After merging the percpu tree, today's linux-next build (sparc64
> defconfig) failed like this:
>
> mm/percpu.c: In function 'pcpu_page_first_chunk':
> mm/percpu.c:3336:17: error: implicit declaration of function 'flush_cache_vmap_early'; did you mean 'flush_cache_vmap'? [-Werror=implicit-function-declaration]
>  3336 |                 flush_cache_vmap_early(unit_addr, unit_addr + ai->unit_size);
>       |                 ^~~~~~~~~~~~~~~~~~~~~~
>       |                 flush_cache_vmap
> cc1: some warnings being treated as errors
>
> Caused by commit
>
>   a95c15a43f4a ("mm: Introduce flush_cache_vmap_early() and its riscv implementation")
>
> I have applied the following fix patch for today.  Are there other
> archs that don't use asm-generic/cacheflush.h?

It seems like most archs do not include this file, I should have
checked. As I'm a bit scared of the possible side-effects of including
asm-generic/cacheflush.h, I'll define flush_cache_vmap_early() on all
archs that do define flush_cache_vmap().

Stephen, do you want a patch fix? Or do you want me to send a new
version of the current patches so that you can drop them for now?

Sorry for the oversight,

Thanks,

Alex

>
> From: Stephen Rothwell <sfr@...b.auug.org.au>
> Date: Mon, 11 Dec 2023 16:57:00 +1100
> Subject: [PATCH] fix up for "mm: Introduce flush_cache_vmap_early() and its riscv implementation"
>
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> ---
>  arch/sparc/include/asm/cacheflush.h | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/arch/sparc/include/asm/cacheflush.h b/arch/sparc/include/asm/cacheflush.h
> index 881ac76eab93..9d87b2bcb217 100644
> --- a/arch/sparc/include/asm/cacheflush.h
> +++ b/arch/sparc/include/asm/cacheflush.h
> @@ -10,4 +10,11 @@
>  #else
>  #include <asm/cacheflush_32.h>
>  #endif
> +
> +#ifndef __ASSEMBLY__
> +static inline void flush_cache_vmap_early(unsigned long start, unsigned long end)
> +{
> +}
> +#endif
> +
>  #endif
> --
> 2.40.1
>
> --
> Cheers,
> Stephen Rothwell